Зачем Lync нужен VoIP Gateway

Довольно часто приходится отвечать на вопросы клиентов, зачем нужен VoIP шлюз для интеграции с ТфОП. Ниже можно посмотреть список основных задач для которых может понадобиться шлюз:

• PSTN Connectivity (T1/E1/POTS/SIP Trunking)
• Connectivity to PBX’s or Unsupported IP-PBX
• Survivability (WAN outage)
• Connectivity for existing SIP headsets
• Optimisation of media traffic for users at a location (Media Bypass)
• Normalising of numbering between Lync and foreign network systems
• SIP normalization via SIP message and header manipulation
• Support Analogue Devices
  • Fax Machines
  • Conference Phones
  • Alarm Systems
  • Data Modem
  • Credit Card Machines
• Transcoding of media between Codec’s
• Conversion of different signalling types and protocols
• Management of Call Routing
• Regulatory Requirements
• In-Country Regulation prohibiting the use of VoIP services (or VoIP restrictions)
• SIP Trunking
  • In-Country Emergency Dialling (where it cannot be provided by SIP trunking provider)
  • In-Country Short-Number Dialling (where it cannot be provided by SIP trunking provider)
  • Issues with call forwarding issues
  • Security (to protect corporate network from the SIP trunk providers network)
• Session Border Controller (when using distributed SIP trunking)
  • NAT transversal (when using SIP trunking across the Internet)
  • Connectivity to SIP trunking provider
  • Enhanced Management (Session Limits, Routing Paths)
  • IPv4 to IPv6 Internetworking